Check your motor mounts. When those go bad the car is almost undrivable due to the noise (personal experience). If that's the case, then you should be good to go. Changing all three mounts should be no more than a 2 hour job.
Sorry about being a smart ass before and I hope I've helped you.
Autolite 103's, Cosworth CAI, FRPP Suspension, Strut Bars, DIY Short Shifter, SVT Air Dam, BSD, Poly Trans Mount...
Duratec Crew #55
Hatch Nation #55